论文部分内容阅读
在Pt/Al_2O_3催化剂上用外循环反应器研究了内扩散对苯完全氧化动力学的影响,当用30～40目(即0.45～0.60mm)催化剂时反应在动力学区域进行.若O_2过量时则动力学区域苯的完全氧化可用-0.9级速率方程描述.当催化剂粒径增至φ6×5mm时,反应在内扩散区域进行并变为一0.1级反应.催化剂有效因子η在0.24～0.12之间.在同一温度下,η_(实验)随苯分压p_苯的增加而增大;而p_苯相近时,η_(实验)则随温度的升高而减小.动力学区域的反应活化能为55.5 kJ/mol,内扩散区域的反应活化能为34.9 kJ/mol,其值约为动力学区域的活化能与苯分子扩散活化能的算术平均值.
The effect of internal diffusion on the complete oxidation kinetics of benzene was studied on an Pt / Al 2 O 3 catalyst using an external circulation reactor, and the reaction was carried out in the kinetic region when 30 to 40 mesh (ie 0.45 to 0.60 mm) catalyst was used. The complete oxidation of benzene in the kinetic region can be described by a rate equation of -0.9. When the catalyst particle size increases to φ6 × 5mm, the reaction proceeds in the inner diffusion region and becomes a 0.1-level reaction. The effective factor η of the catalyst ranges from 0.24 to 0.12 At the same temperature, η_ (experimental) increases with the increase of benzene partial pressure (p_benzene), while η_ (experimental) decreases with the increase of temperature when p_ benzene phase is near. The activation energy is 55.5 kJ / mol, and the reaction activation energy is 34.9 kJ / mol in the inner diffusion region. The value is about the arithmetic average of the activation energy in the kinetic region and the activation energy of benzene molecule diffusion.